Twin piston power transmission mechanism with a bent link

ABSTRACT

A twin piston power transmission mechanism with a bent link, the end of the link connecting with a cylinder is a bent arm, the link has thereon for a first piston rod and a second piston rod each a bushing hole to respectively mount a main piston and a secondary piston of a piston set, the bushing hole for the first piston rod is deviated from the shank of the link; a movable connecting piece is provided between the bushing hole for the first piston rod and the main piston to make connection of the piston with the link; when the piston is raised to an upper dead point, the accelerating power at the beginning of lowering the piston will generate a component force in a tangential direction of biased circular motion of a driving wheel by deviation of the bushing hole for the first piston rod from the shank of the link. Thereby, the driving wheel immediately obtains an accelerating power in the tangential direction, and running of the driving wheel can be smoother; power of the piston set can thus be completely developed.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention is related to a twin piston powertransmission mechanism with a bent link, and especially to such atransmission mechanism of which the initial accelerating power oflowering pistons can generate a component force along the tangentialdirection of biased circular motion of a driving wheel, so that thedriving wheel can immediately obtain a tangential accelerating power onthe circle of the circular motion, and running of the driving wheel canbe smoother. Such a transmission mechanism not only can completelydevelop the power of the pistons, but also can reduce damage of a link.

[0003] 2. Description of the Prior Art

[0004] The mode of power generation of a conventional internal combustorhas a cylinder as a place to burn mixed gas; and has a piston to run toand fro in the cylinder, a spark plug is provided above the cylinder forigniting the mixed gas, an inlet port and an exhausting port areprovided in the cylinder, a link is provided on the bottom of thecylinder to connect the piston and a driving wheel. Wherein, the drivingwheel is a component for outputting power of the internal combustor; thepower can change the reciprocating linear movement of the piston into arotating movement of the driving wheel through the link.

[0005] By the fact that the link is used to change the linear movementof a piston into a rotating movement of the driving wheel, when theengine is running, under up and down motion of the piston, the linkcontinuously accelerates and decelerates, and especially makes an upwardsudden deceleration to stop the motion of the link when the pistonreaches a dead point, and changes the direction of movement immediately;and when the link moves to the dead point, the axis of the shank of thelink is aligned with the direction of movement of the piston and theaxis of the driving wheel, at this time, it is most easily to have thelink damaged. Therefore, in designing an internal combustor, generally aweight is provided on the driving wheel in order that the driving wheelcreates an inertia effect during rotation to bring the link away to bedeviated a suitable angle from the direction of movement of the pistonwhen the piston is raised to its upper dead point; and the ignition timeis controlled to render an accelerating power to generate after thedeviation of the link from the direction of movement of the piston thissuitable angle. Thereby, the driving wheel can run normally, and thelink can avoid direct damage.

[0006] However, the ignition time of the internal combustor iscontrolled at the moment of the deviation of the link from the directionof movement of the piston this suitable angle, at this time, the pistonhas been lowered a slight distance of its stroke, hence the bestcompression ratio (the quotient of the total volume of the cylinder whenthe piston is at the dead point over the total volume of the chamber ofthe combustor when the piston is at the dead point) can not be obtained,and thereby, the piston is unable to completely develop its wholestroke; additionally in practice, control of the ignition time is moredifficult.

SUMMARY OF THE INVENTION

[0007] In view of this, in the twin piston power transmission mechanismwith a bent link of the present invention, the end of the link inconnecting with a cylinder is designed to be in the form of a bent arm,so that a bushing hole for a piston rod to receive a piston on the endof the link is arranged to be a suitable angle deviated from the shankof the link; a movable connecting piece is provided between the bushinghole for the piston rod and the piston to make connection of the pistonwith the link, so that the link can have a swinging action against thepiston when the driving wheel is rotated; and when the piston is raisedto its upper dead point, the accelerating power at the beginning oflowering of the piston will generate a component force in the tangentialdirection of the biased circular motion of the driving wheel bydeviation of the bushing hole for the piston rod from the shank of thelink. Thereby, the driving wheel can immediately obtain an acceleratingpower in the tangential direction of the circular motion, and running ofthe driving wheel can be smoother; power of the piston can thus becompletely developed, and this is the primary object of the presentinvention.

[0008] Another object of the twin piston power transmission mechanismwith a bent link of the present invention is to provide a piston setstructure with two pistons on the end of the link in connecting with thecylinder, and the link is provided with a bushing hole for a firstpiston rod and a bushing hole for a second piston rod to allowrespectively mounting of the main piston and a secondary piston of thepiston set. Wherein, the bushing hole for the first piston rod isarranged a suitable angle deviated from the shank of the link, and themain piston on the upper portion of the piston set accepts or transmitspower when pressure in the cylinder changes, while the secondary pistonon the lower portion of the piston set is a hollow piston used to allowextending of the link therethrough and can swing about the second pistonrod of the secondary piston, so that the secondary piston can form asteady link swinging action.

[0009] Another object of the twin piston power transmission mechanismwith a bent link of the present invention is to arrange a bushing holefor mounting a connecting piece provided on the main piston in adeviated way, so that when the piston set is raised to its upper deadpoint, the connecting piece between the main piston and the link isparallel to the action direction of the piston. Thereby, when the pistonset is lowered, the component force of the accelerating power can begenerated on one side of the driving wheel to be able to forwardly runthe driving wheel.

[0010] A further object of the twin piston power transmission mechanismwith a bent link of the present invention is to arrange the cylinder andthe axis of the driving wheel in a mutually deviated mode, so that whenthe piston set is raised to its upper dead point, the shank of the linkis not aligned with the direction of movement of the piston set nor withthe axis of the driving wheel, thereby damage rate of the link can belowered.

[0011] Another object of the twin piston power transmission mechanismwith a bent link of the present invention is to separate the strokes ofthe movements of the main piston and the secondary piston in thecylinder into different sections and suitably make a deviation betweenthe two, so that the action directions of the main piston and thesecondary piston will not be in an identical axis, hence abrasion on theinner wall of the cylinder can be reduced. And boring operation for thedifferent sections with different degrees of abrasion can be separatelycarried on to lower cost of maintaining the cylinder.

[0012] The present invention will be apparent after reading the detaileddescription of the preferred embodiment thereof in reference to theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013]FIG. 1 is a perspective view showing the structure of the presentinvention;

[0014]FIG. 2 is an analytical perspective view showing the structure ofthe present invention;

[0015]FIG. 3 is a sectional view showing the structure of the presentinvention;

[0016]FIG. 4 is a schematic view showing the piston of the presentinvention at the upper dead point thereof;

[0017]FIG. 5 is a sectional view showing the structure of anotherembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0018] Referring firstly to FIG. 1, the twin piston power transmissionmechanism with a bent link of the present invention is a mechanism usedto turn running to and fro of a piston set 4 in a cylinder 1 under theinternal pressure of the cylinder 1 into a rotating movement. Wherein, alink 3 is used to connect a driving wheel 2 and the piston set 4, sothat when the piston set 4 bears the internal pressure of the cylinder 1and moves to and fro in the cylinder 1, its power can change thereciprocating linear movement into the rotating movement of the drivingwheel 2 through the link 3.

[0019] Referring simultaneously to FIGS. 2 and 3, the end of the link 3in connecting with the cylinder 1 is designed to be in the form of abent arm, and has a structure of piston set 4 having two pistons. Theend of the link 3 to be in the form of a bent arm is provided with abushing hole 31 for a first piston rod to receive a main piston 41 andwith a bushing hole 32 for a second piston rod to receive a secondarypiston 42 respectively. The bushing hole 31 for the first piston rod isarranged to be a suitable angle deviated from the shank of the link 3,while a movable connecting piece 33 is provided between the bushing hole31 for the first piston rod and the main piston 41 to make connection ofthe main piston 41 with the link 3. The two ends of the connecting piece33 respectively allow extending of a piston rod 43 into the bushing hole31 for the first piston rod of the link 3 and allow extending of anotherpiston rod 43 into a bushing hole 411 of the connecting piece 33, sothat the driving wheel 2 can have a swinging action against the mainpiston 41 when the driving wheel 2 is rotated. And the main piston 41accepts or transmits power when pressure in the cylinder 1 changes. Thesecondary piston 42 on the lower portion of the piston set 4 similarlyallows the other piston rod 43 to extend into the bushing hole 32 of thelink 3, it is a hollow annular block used to allow extending of the link3 therethrough and swinging about the second piston rod 43 of thesecondary piston 42, so that the secondary piston 42 can form a steadylink swinging action. As shown in FIG. 4, when the piston set 4 israised to its upper dead point, an accelerating power at the beginningof lowering of the main piston 41 will generate a component force in atangential direction of the biased circular motion of the driving wheel2 by deviation of the bushing hole 31 for the first piston rod from theshank of the link 3. Thereby, the driving wheel 2 can immediately obtainan accelerating power in the tangential direction of the circularmotion, and running of the driving wheel 2 can be smoother; and power ofthe piston set 4 can be completely developed.

[0020] And more, in the present invention, the bushing hole 411 on themain piston 41 for the connecting piece 33 is arranged to be deviated,so that when the piston set 4 is raised to its upper dead point, theconnecting piece 33 between the main piston 41 and the link 3 isparallel to the action direction of the piston set 4. Thereby, when themain piston 41 is lowered, the component force of the accelerating powercan be generated on one side of the driving wheel 2 to be able toforwardly run the driving wheel 2. And the cylinder 1 and the axis ofthe driving wheel 2 are arranged in a mutually relatively deviated mode,so that when the piston set 4 is raised to its upper dead point, theshank of the link 3 is not aligned with the direction of movement of thepiston set 4 nor with the axis of the driving wheel 2, thereby damagerate of the link 3 can be lowered. Further as shown in FIG. 5, thestrokes of the movements of the main piston 41 and the secondary piston42 in the cylinder 1 can be separated into different sections tosuitably make a deviation between the two pistons, so that the actiondirections of the main piston 41 and the secondary piston 42 will not bein an identical axis, hence abrasion on the inner wall of the cylinder 1can be reduced. And boring operation for the different sections withdifferent degrees of abrasion can be separately carried on to lower costof maintaining the cylinder.

[0021] The twin piston power transmission mechanism with a bent link ofthe present invention makes the end of the link in connecting with thecylinder designed be in the form of a bent arm, so that the bushing holefor a first piston rod to receive the main piston on the end of the linkis arranged to be a suitable angle deviated from the shank of the link;a movable connecting piece is provided between the bushing hole for thefirst piston rod and the main piston to make connection of the mainpiston with the link, so that the driving wheel can have a swingingaction against the main piston when the driving wheel is rotated, andwhen the piston is raised to its upper dead point, the acceleratingpower at the beginning of lowering of the piston will generate acomponent force in the tangential direction of the biased circularmotion of the driving wheel by deviation of the bushing hole for thefirst piston rod from the shank of the link. Thereby, the driving wheelcan immediately obtain an accelerating power in a tangential directionof the circular motion, and running of the driving wheel can besmoother; power of the piston set can thus be completely developed, andthis provides the preferred power transmission mechanism of the presentinvention. Having thus described my invention, what I claim as new anddesire to be secured by Letters Patent of the United States are:

1. A twin piston power transmission mechanism with a bent link, saidlink connects a driving wheel with a piston, when said piston bearsinternal pressure of a cylinder to run said piston to and fro, its powerturns the reciprocating linear movement of said piston into a rotatingmovement of said driving wheel through said link; said mechanism ischaracterized by: an end of said link in connecting with said cylinderis designed to be in the form of a bent arm, so that a bushing holeprovided for a piston rod to receive a piston on said end of said linkis arranged to be a suitable angle deviated from said shank of saidlink; a movable connecting piece is provided between said bushing holefor said piston rod and said piston to make connection of said pistonwith said link, so that said link has a swinging action against saidpiston when said driving wheel is rotated; and when said piston israised to its upper dead point, accelerating power at the beginning oflowering said piston generates a component force in a tangentialdirection of biased circular motion of said driving wheel by deviationof said bushing hole for said piston rod from said shank of said link,thereby, said driving wheel immediately obtains an accelerating power insaid tangential direction of said circular motion, and running of saiddriving wheel is smoother; power of said piston can thus be completelydeveloped.
 2. A twin piston power transmission mechanism with a bentlink, said link connects a driving wheel with a piston set including twopistons, i.e., a main piston and a secondary piston, when said pistonset bears internal pressure of a cylinder to run said piston set to andfro, its power turns the reciprocating linear movement of said pistonset into a rotating movement of said driving wheel through said link;said mechanism is characterized by: an end of said link in connectingwith said cylinder is designed to be in the form of a bent arm, abushing hole for a first piston rod and a bushing hole for a secondpiston rod are provided on said link to allow respectively mounting ofsaid main piston and said secondary piston, said bushing hole for saidfirst piston rod is arranged a suitable angle deviated from said shankof said link; a movable connecting piece is provided between saidbushing hole for said first piston rod and said main piston to makeconnection of said main piston with said link; and said main piston onthe upper portion of said piston set accepts or transmits power whenpressure in said cylinder changes, while said secondary piston on thelower portion of said piston set is a hollow piston used to allowextending of said link therethrough and to swing about said secondpiston rod of said secondary piston, so that said secondary piston formsa steady link swinging action; and when said piston set is raised to itsupper dead point, accelerating power at the beginning of lowering saidpiston set generates a component force in a tangential direction ofbiased circular motion of said driving wheel by deviation of saidbushing hole for said first piston rod from said shank of said link,thereby, said driving wheel immediately obtains an accelerating power insaid tangential direction of said circular motion, and running of saiddriving wheel is smoother; power of said piston set can thus becompletely developed.
 3. A twin piston power transmission mechanism witha bent link as in claim 1, wherein, a bushing hole for mounting aconnecting piece is provided on said piston in a deviated way, so thatwhen said piston is raised to its upper dead point, said connectingpiece between said piston and said link is parallel to the actiondirection of said piston, thereby, when said piston is lowered, saidcomponent force of said accelerating power is generated on one side ofsaid driving wheel to be able to forwardly run said driving wheel.
 4. Atwin piston power transmission mechanism with a bent link as in claim 2,wherein, a bushing hole for mounting said connecting piece is providedon said main piston in a deviated way, so that when said piston set israised to its upper dead point, said connecting piece between said mainpiston and said link is parallel to the action direction of said piston,thereby, when said piston set is lowered, said component force of saidaccelerating power is generated on one side of said driving wheel to beable to forwardly run said driving wheel.
 5. A twin piston powertransmission mechanism with a bent link as in claim 1, wherein, saidcylinder and the axis of said driving wheel are arranged in a mutuallydeviated mode, so that when said piston is raised to said upper deadpoint, said shank of said link is not aligned with the direction ofmovement of said piston nor with said axis of said driving wheel,thereby damage rate of said link is lowered.
 6. A twin piston powertransmission mechanism with a bent link as in claim 2, wherein, strokesof movements of said main piston and said secondary piston in saidcylinder are separated into different sections to suitably make adeviation between said main and said secondary pistons, so that theaction directions of said main piston and said secondary piston are notin an identical axis, hence abrasion on the inner wall of said cylinderis reduced, and boring operation for said different sections withdifferent degrees of abrasion is separately carried on to lower cost ofmaintaining said cylinder.